Reamer



'Dec.29,1942. w. B. NOBLE" ,306,4

REAMER Wiley 5 Nole.

INVENTOR. I

MTTORNEY.

Patented Dec. 29, 1942 Wiley B. Noble, HouStomiTexL; assignoi" to neeRoller Bit Company, Houston,- Ten, 2; corpora- ,tion of TexasApplication November 23, 1940, S1-"ial l\To; 366,817.

6 Claims. (QL'255 -73) This invention relates to reamers and has particular reference to that type of reamer' adapted to be placed in adrilling string above the usual drill bit for drilling a well ho'le.

Each of these cutters is'carried on a bearing shaft 6, which in theexample shown is made integral with asupportihg block I inthe lowerauxiliary recess. The upper end .of. each suchshaftt 'is' It is anobjectof this invention .to provide such g carrie'dlin asecond'supp'orting block 3 mounted in a reamer in which the learnercutters may be readily removed and replaced. f j

Another object is to provide such a structure in which the removal andreplacement ofthe cutters will not necessitate the use of any specialtools whatever. I

A further object is to provide a structure in which no bolts or threadedparts are required.

A still further object is to provide such a structure which will be sosure .in its operation that the reamer cutters will be 'firmlyjandrigidly mounted upon the reanier body and'will not be the upperauxiliary recess .4. These supporting blocks are-located properly with.respect to the major 'recess .by means (of pins .9 extending throughtransverse openings It in the body of the T5 wedge-shaped opening on itsend remote from the come loosened or lost in use, but in which they maybe easily and quickly removed and replaced.

Other objects and advantages of. this invention will become apparentfrom the following description taken in connection with the accompanyingdrawing wherein one embodiment of this invention is illustrated. I I

In' the drawing:

Fig. 1 is a side elevation of a reamer constructed with this invention.

Fig. 2 is a partial longitudinal cross section through the bodly of thereamer shown inFighl taken along-the axis of one of the reamer cut"-ters and showing the means for. mounting the same on the reamer body; I

Fig. 3 is a transverse cross section through the structure shown in Fig.1 taken along the line 33 of Fig. 1.

Fig. 4 is a transverse section through the structure shown in Fig. 1taken along the line 4.-'4

of Fig. 1.- u p The body l of the reamer shown in the drawing isprovided with a plurality of circumferentially spaced major recesses 2,each of which has an auxiliary recess 3 adjacent its lower end andasecondary auxiliary recess 4 adjacent its upper end, these auxiliaryrecesses opening into the major recess.

Each of the auxiliary recesses Sand 4 has adjacent the major recess aportion of trapezoidal cross section. The auxiliary recess 3 also has aportion more remote from the major recess which is not a trapezoidalcross section but which is of a width substantially equal to the widestdimension of that portion which is of trapezoidal cross section. I 7 NThis reamer is provided with three roller cutters 5, each mounted in oneof the ma or recesses 21 55 cutter., Received in'this' opening in eachof the blocks is a wedge H, which when driven home serves to spread theprongs of. the bifurcated pore tion'of each block'and'wed'ge it tightlyin place. At the same time, eachof these wedges is provided on itsnosewith a slot H of a width adapted to straddle a reduced intermediateportion I3 of one of the pins9'. Thus, when the wedge H is in A placethe pin 9 which cooperates with the same Q5 supporting block cannot bewithdrawn.

After the wedges H are driven home by means of a hammer or the like,they are secured in place by of the respective supporting blocks. Theseportions [4 are bent inwardly around the bases of the respective wedgesso as to prevent them from coming but.

serting it through the'major recess 2 'into the lower portion of theupper auxiliary recess 4. The cutter 5 will then be put in place in themajor recess and the lower supporting block I inserted through the lowerportionof the lower auxiliary recess 3. When in. this position the shaft6 will extend upwardly into the major recess and the lower block andshaft may then be pushed upwardly through the cutter 5 until the upperend .of the. shaft fits into the upper supporting block 8,.as shown inFig. 2. The pins 9 are now put in position-and the wedges l I driveninto the Wedgeshaped openings in the respective supporting blocks 1 and8', after whichvthe portions [4 will be bentinwardly behind the wedgesto hold them in place.

It will be seen from the foregoing that by the" In'mounting thereamercutter in the reamer 35 body in accordance with this invention,the upper supporting. block 8 will first be put in place by inrigidlymounted in a reamer body in such a manner that it cannot be readilydisplaced therefrom in use nor can it become loosened so as to impairthe action of the reamer. At the same time it will be readily observedthat such cutter can be mounted in the reamer body and removed therefromat will with no special tools and without the necessity for even suchtools as wrenches or the like. There is no threaded part and nothingwhich can be readily damaged in handling to such an extent that itcannot be used.

Having described my invention, I claim:

1. In a well forming tool, a body having a recess in its surface for acutter, a cutter in said recess, means for supporting said cutterincluding cooperating wedge and bifurcated elements, the Wedge elementlying between the prongs of the bifurcated element, said elements beingadapted to be driven relatively to each other to force the prongs of thebifurcated element into frictional engagement with the walls of therecess, deformable means carried by one of said elements adapted to bedeformed into blocking engagement with the other element to retain saidelements in assembled relation, and a pin extending through the walls ofthe recess and through one of said elements to anchor the latter, saidpin having a portion of reduced diameter intermediate its ends and theother of said elements having a notch in its end adapted, when inassembled position with the anchored element, to receive the reducedportion of said pin to retain the pin in position.

2. In a well forming tool, a body having a recess in its surface for acutter, a cutter in said recess, means for supporting said cutterincluding cooperating wedge and bifurcated elements, the wedge elementlying between the prongs of the bifurcated element, said elements beingadapted to be driven relatively to'each other to force tional engagementwith the walls of the recess, a pin extending through the walls of therecess and through one of said elements to anchor the latter, said pinhaving a portion of reduced diameter intermediate its ends and the otherof said elements having a notch in its end adapted,'when and means forretaining said elements in assembled relation.

4. In a reamer of the character described, a body having a plurality ofcircumferentially spaced longitudinally extending recesses in its outersurface, a cutter in each recess intermediate the ends thereof, a pairof bifurcated elements in each recess one adjacent each end of thecutter, the width of said bifurcated elements being substantially equalto the width of said recess, a wedge element between the prongs of eachbifurcated element, the bifurcated and wedge elements at each end ofeach cutter being adapted 40, the prongs of the, bifurcated element intofric to be forced together to spread the prongs of the bifurcatedelement into frictional engagement with the walls of the recess, meansfor mounting each" end of the cutter on one of the two assembledelements at each end thereof, a pin extending transversely through thewalls of the recesses at each end of each cutter and passing through oneof the two assembled elements in the recess at each end of the cutter,said pin having a portion of reduced cross section and the other of saidtwo assembled elements having a notch to receive the portion of the pinof re duced cross section to prevent axial displacement of the pin, anddeformable means for retaining the assembled elements at each end of thecutter in assembled relation.

5. In a reamer of the character described, a body having a plurality ofcircumferentially spaced longitudinally extendingrecesses in its outersurface, a cutter in each recess intermediate the ends thereof, a pairof bifurcated elements in each recess one adjacent each end of thecutter, the width of said bifurcated elements being substantially equalto the width of said recess, a wedge element between the prongs of eachbifurcated element, the bifurcated and wedge elements at each end ofeach cutter being adapted to be forced" together to spread the prongs ofthe bifurcated element into frictional engagement with the walls of therecess, means for mounting each end of the cutter on one of the twoassembled elements at each end thereof, a pin extendin assembledposition with the anchored element,

to receive the reduced portion of said pin to retain the pin inposition, and means for retaining said elements in assembled position.

3. In a reamer of the character. described, a

body having a plurality of circumferentially spaced longitudinallyextending recesses in its outer surface, a cutter in each recessintermediate.

the ends thereof, a pair of bifurcated elements in each recess oneadjacent each end of the cutter,

bifurcated element into frictional engagement.

with the walls of the recess, means for mounting each end of the cutteron one of the two assembled elements at each end thereof, alpinextending transversely through the walls of the recesses at each end ofeach cutter and passing through one of the two assembled elements in therecess at each end of the cutter; said pin having a por-,

tion of reduced cross section and the other of said two assembledelements having a notch. to receive the portion of the pin of reducedcross section to prevent axial displacement of 'the;pi r1,

ing transversely through the walls of therecesses at each end of eachcutter and passing through one of the two assembled elements in therecess at each end of the cutter, said pin having a portion ofreducedcross section and the other of said two'assembled elements having anotch to receive the portion of the pin of reduced cross section topreventaxial displacementof. the pin, and deformable extensions onthefree ends of the prongs of said'bifurcated elements for retaining thebifurcated and wedge elementsat each end of the cutter in assembledrelation.

6. In a reamer of the character described, a body having a plurality ofcircumferentially spaced longitudinally extending recesses, in its outersurface, a cutter in each recess intermediate the ends thereof, a pairof bifurcatedelements in each recess one adjacent, each end of thecutter, the width of said bifurcated elements being substantially equalto the Width of said e e n iqns on, the f e nds h the; st in s.

of said bifurcated elements for retaining the bifurcated and wedgeelements at each end of the cutter in assembled relation, and a pinextending transversely through the walls of the recess at each end ofthe cutter and through the 5 position.

prongs of the bifurcated element, said pin hav-- ing a portion ofmodified cross section, each wedge element having aportion adapted tocooperate with the portion of the pin of modified cross section toprevent axial displacement of the pin when the elements are in assembledB. NOBLE.

